U.S. Bureau of Reclamation - Central Valley Operations Office
Delta Outflow Computation (values in c.f.s.)

APRIL 1998
          Estimated numbers are in bold italic print
                                                DELTA INFLOW                                                            DELTA EXPORTS                                               OUTFLOW INDEX
           Sacto R              Yolo +  East Side      S. Joaquin River@Vernalis  Total              Clifton              Contra    Byron               Total   3-day                                   Export/
          @Freeport    SRTP      Misc    Streams            7-day      Monthly    Delta               Court     Tracy     Costa    Bethany     NBA      Delta      Avg       NDOI   7-day      Monthly  Inflow
   Date   -prev day--prev wk- -prev day--prev day--prev day- Average   Average    Inflow     NDCU   (CLT)     (TRA)     (CCC)     (BBID)               Exports  TRA & CLT   daily      Avg       Avg    (%)
 04/01/98    73,433       225    51,665     4,179    22,536    19,041    22,325   152,038      (760)        0     1,748       148         0        19     1,916     2,372   150,883   161,334   150,883   1.1%
 04/02/98    72,285       222    37,945     4,080    22,325    20,017    22,055   136,857      (532)        0     3,493       199         0        16     3,708     2,639   133,681   159,672   142,282   2.6%
 04/03/98    70,877       218    25,762     3,797    21,784    20,766    21,773   122,438      (989)        0     2,871       199         0        20     3,090     2,704   120,337   153,590   134,967   2.3%
 04/04/98    70,631       215    23,773     5,195    21,210    21,356    21,595   121,024    (2,764)        0     1,074       184         0        16     1,274     2,479   122,514   146,387   131,854   0.9%
 04/05/98    70,760       211    23,884     4,905    21,059    21,655    21,499   120,819    (2,993)        0       731       165         0        16       912     1,559   122,900   139,335   130,063   0.6%
 04/06/98    70,160       208    19,367     4,436    21,115    21,583    21,425   115,286      (710)        0       764       193         0        14       972       856   115,025   131,885   127,557   0.7%
 04/07/98    69,450       204    15,813     4,211    21,054    21,373    21,373   110,732    (1,167)        0     1,369       194         0        18     1,581       955   110,318   125,094   125,094   1.2%
 04/08/98    69,053       201    13,570     4,348    21,063    21,247    21,382   108,235      (660)        0     1,713       217         0        20     1,950     1,282   106,945   118,817   122,825   1.6%
 04/09/98    68,848       201    12,168     4,024    21,442    21,292    21,461   106,683     1,165         0     1,004       241         0        18     1,263     1,362   104,254   114,613   120,762   0.9%
 04/10/98    68,651       201    10,854     3,826    22,098    21,494    21,578   105,630     1,394         0       738       200         0        19       956     1,152   103,281   112,177   119,014   0.7%
 04/11/98    67,940       201     6,582     3,604    22,629    21,731    21,682   100,956     1,394         0       766       249         0        17     1,032       836    98,530   108,751   117,152   0.8%
 04/12/98    66,861       201     2,930     3,422    22,719    21,982    21,781    96,133       481         0       762       205         0        15       982       755    94,671   104,718   115,278   0.8%
 04/13/98    65,086       201     1,634     3,480    22,870    22,336    21,915    93,271        74         0       761       240         0        27     1,028       763    92,168   101,453   113,501   0.8%
 04/14/98    63,237       201     1,900     4,375    23,529    22,802    22,087    93,242    (1,980)        0       758       258         0        41     1,057       760    94,164    99,145   112,119   0.8%
 04/15/98    61,570       201     2,431     4,582    24,325    23,276    22,266    93,109    (2,208)        0       761       247         0        53     1,061       760    94,256    97,332   110,928   0.8%
 04/16/98    59,488       201     2,059     5,282    24,763    23,666    22,426    91,793    (2,208)        0       609       268         0        51       928       710    93,073    95,735   109,812   0.7%
 04/17/98    56,714       201     2,169     4,898    24,825    23,986    22,569    88,807      (839)        0     1,001       252         0        49     1,302       791    88,343    93,601   108,550   1.1%
 04/18/98    53,918       201     1,450     4,101    24,868    24,262    22,685    84,538      (382)        0       847       253         0        58     1,158       819    83,762    91,491   107,173   1.0%
 04/19/98    50,558       201     1,776     3,856    24,656    24,456    22,766    81,047     1,672         0       847       249         0        56     1,151       898    78,224    89,141   105,649   1.0%
 04/20/98    47,402       201     1,768     3,788    24,228    24,488    22,816    77,387     1,900         0     1,525       248         0        58     1,831     1,073    73,656    86,497   104,049   2.0%
 04/21/98    45,521       201     1,681     3,412    23,753    24,292    22,822    74,568     1,900         0     1,919       209         0        59     2,187     1,430    70,481    83,114   102,451   2.6%
 04/22/98    44,973       201     1,364     3,071    22,953    23,812    22,758    72,562     1,900         0     1,919       172        27        64     2,129     1,788    68,533    79,439   100,909   2.6%
 04/23/98    44,133       201       886     3,502    21,404    23,167    22,651    70,126     1,900         0     1,921       252        13        60     2,220     1,920    66,006    75,572    99,392   2.7%
 04/24/98    43,959       201       672     3,932    20,305    22,472    22,541    69,069     1,950         0     1,942       250        10        47     2,229     1,928    64,890    72,222    97,954   2.8%
 04/25/98    44,977       201       606     4,213    20,005    21,755    22,425    70,002     1,950         0     1,909       249        20        41     2,179     1,924    65,873    69,666    96,671   2.7%
 04/26/98    46,742       201       505     4,180    19,635    21,077    22,312    71,263     1,950       504     1,916       249        20        42     2,691     2,090    66,622    68,009    95,515   3.4%
 04/27/98    47,660       201       445     4,015    19,486    20,428    22,197    71,807     1,950        16     1,924       252        10        48     2,230     2,090    67,627    67,148    94,482   2.7%
 04/28/98    47,507       201       417     3,532    19,210    19,852    22,080    70,867     2,000         0     1,919       256        10        57     2,223     2,093    66,644    66,599    93,488   2.7%
 04/29/98    48,028       201       401     3,261    18,921    19,457    21,961    70,812     2,000         0     1,924       281        26        43     2,222     1,928    66,590    66,322    92,560   2.7%
 04/30/98    47,361       201       392     3,403    18,639    19,178    21,841    69,996     2,000         0     1,924       294        20        42     2,239     1,922    65,757    66,286    91,667   2.7%


  Total   1,757,783     6,126   266,869   120,910   659,409   658,300   663,043 2,811,097     9,387       520    43,361     6,872       156     1,104    51,701    44,638 2,750,009 3,045,143 3,374,599  50.0%
 Average     58,593       204     8,896     4,030    21,980    21,943    22,101    93,703       313        17     1,445       229         5        37     1,723     1,488    91,667   101,505   112,487   1.7%